This has also happened to me. I was notified (in windows store) that there were updates to finance, sports, news, travel, Kindle. None of them will update and now I cannot install any new apps. It just says it could not install the update and uses error code: 80240437. As far as I can tell that is MS speak for "I don't know what happened!"
It has also happened this week to my daughters new dell tablet. I am running Windows 8 Pro and she is running Windows 8 RT. We have run the troubleshooter, the wsreset, checked the proxy, and are both using the MS virus checker. Based on the recent flurry of posts across the web I am beginning to think it is an update MS sent out. Short of completely stripping and reloading the machine, anyone have any more ideas?